Are there different types of lung abscess? bacterial/fungal after pnuemonia & flu a? how is the recovery after lung damage in 21yr old ventil' patient

Yes: After severe influenza a secondary bacterial process would be typical. Fortunately young patients are resilient and a functional recovery is expected.

Yes: Recovery in young person should be good depending on the extent of damage and baseline condition of lung.

All those and more: There are various types of lung abscesses, most due to a bacteria. In a vent dependent patient the recovery depends on multiple factors such as reason on a vent, length of time vent dependent, type of bacteria, size of abscess, etc. Chance of having a resistant bacterial infection in a vent dependent patient is much higher. Iv antibiotics, perc drainage, and in severe cases, surgery.